Messages - Nimrod

Hi I've been using the NHD-C0216CZ-NSW-BBW-3V3 run at 3 volts, but had an occasion where the PIC16F controller was sending SPI which was running at 5v. This did not seem to do any damage, and looking at the controller chip (ST7032) on the LCD, it would appear to be capable of taking 2.7v to 5.5v from an interface point of view. Is it okay to continue, as it will save having to put in level shifting logic, or am I slowly cooking the LCD unit? The backlight was only 3v, under PWM control.